Refactor the argument miner class

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• [x] Remove unnecessary code from the miner class.
• [ ] Refactor some functions: change private functions/methods to be inner ones, and decouple functions as much as possible.
• [ ] Check the code for clustering arguments.

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Document embedding through BOC (Bag Of Concept): https://www.analyticsvidhya.com/blog/2022/01/from-word-embedding-to-documents-embedding-without-any-training/

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spacy tutorial: https://course.spacy.io/en

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Topic modeling: https://towardsdatascience.com/topic-modelling-in-python-with-spacy-and-gensim-dc8f7748bdbf Coherence score review: https://www.baeldung.com/cs/topic-modeling-coherence-score

NB: CV the coherence score is not recommended, even by its author.